Tube-number record
4B38
0 archive entries
4B38 is a tube type in the TubeDatabase archive (class: Air Cooled Beam Power Tube). Recorded specifications: brand Nippon Electric Co. Ltd, construction Beam tetrode / beam power, socket Special / none, maximum plate voltage 1250 V, and maximum plate dissipation 150 W. The archive does not yet hold a photographed example of this type.
BrandNippon Electric Co. Ltd
ClassAir Cooled Beam Power Tube
BaseSpecial / none
Filament6.3 V @ 4.8 mA
Construction
Primary TypeBeam tetrode / beam power
EnvelopeGlass
SectionsSingle
Filament / Heater
Heater NotesWarming up time: 60 seconds
Absolute Maximum Ratings
Plate Voltage1250 V
Typical Operation
| Mode | Plate V | Gm (µmhos) | Rp (Ω) | µ | Plate mA |
|---|---|---|---|---|---|
| AF Power Amplifier Class AB1 (Two Tubes) | 800 V | 20000 | — | — | 800 mA |
| AF Power Amplifier Class AB1 (Two Tubes) | 1000 V | 20000 | — | — | 720 mA |
| Cathode Follower Amplifier (Two Tubes) | 800 V | — | — | — |
Application Notes
When fixed bias is used, grid No.1 circuit resistance should be 50k Ohms or less. Peak Cathode to Grid No.1 Voltage should never exceed +300 Volts.
Datasheets
Datasheet: 4B38.pdf
Download PDFLoading datasheet...
Datasheets courtesy of Frank Philipse via Frank's Electron Tube Data Sheets.
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